Abstract
Occurrence of BKD was confirmed at 5 fish farms, 3 hatcheries and 2 aquaria for eight species of salmonid (Oncorhynchus keta, O. gorbuscha, O. kisutch, O. tschawytscha, O. nerka, O. masou, Salmo gairdneri irideus and S.gardneri gairdneri)in Hokkaido during the period from 1973 to March, 1978.
Signs of BKD and gram positive bacteria were found among rearing O. masou and O. kisu ch at 2 out of the 5 fish farms, but could not find BKD among anadromous O. keta captured in five rivers in Hokkaido in 1976 and 1977.
